1:45 p.m.A Jordan surface theorem for three-dimensional digital spaces.Ralph Kopperman, City College, City University of New York
Paul R. Meyer*, Herbert H. Lehman College, City University of New York
Richard G. Wilson, Herbert H. Lehman College, City University of New York
(851-54-11)

2:15 p.m.A general Voronoi diagram as a spatial metric.John D. Radke*, University of Pennsylvania
(851-51-98)